PT-2026-66476 · S9Y · Serendipity

Vaibhav Kubade · CVE-2026-67351 · Published 2026-07-30 · Updated 2026-07-30

NVD

CVSS v3.1

8.8

High

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Serendipity before 2.6.1 contains an authentication context confusion vulnerability where password validation and session loading operate independently without ensuring both use the same user record. An authenticated Editor can create a username collision with an Administrator account and obtain administrative privileges by logging in with their own password while the session loads the Administrator's account data.

Fix

Weakness Enumeration

CWE-304

Related Identifiers

CVE-2026-67351

Affected Products

Serendipity

References · 3

• https://github.com/s9y/Serendipity/security/advisories/GHSA-v645-243f-jwgh · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-67351 · Security Note
• https://vulncheck.com/advisories/serendipity-authentication-bypass-via-username-collision · Note